Noise Exposure and Hearing Conservation Programs Flashcards

Under OSHA's 5 dB exchange rate, what is the permissible exposure duration for a worker exposed to a steady 100 dBA?

Answer: 2 hours

Using T = 8/2^((L-90)/5), 100 dBA yields 8/2^2 = 2 hours.

A noise dosimeter reports a full-shift dose of 200%. What is the equivalent 8-hour TWA?

Answer: 95 dBA

TWA = 16.61 log10(200/100) + 90 = 95 dBA.

Two identical compressors each produce 88 dBA at a worker's position. What is the approximate combined level?

Answer: 91 dBA

Decibels add logarithmically, so two equal sources increase the level by about 3 dB.

A worker spends 4 hours at 95 dBA and 4 hours at 90 dBA. What is the noise dose?

Answer: 150%

Dose = 100 × (4/4 + 4/8) = 150%.

Which OSHA construction standard sets the permissible noise exposure limits shown in Table D-2?

Answer: 29 CFR 1926.52

29 CFR 1926.52 contains the construction occupational noise exposure limits in Table D-2.

What is the maximum impulse or impact noise level OSHA states should not be exceeded?

Answer: 140 dB peak

OSHA states exposure to impulsive or impact noise should not exceed 140 dB peak sound pressure level.

When noise exposure exceeds Table D-2 values, what does OSHA require the employer to use FIRST?

Answer: Feasible administrative or engineering controls

1926.52(b) requires feasible administrative or engineering controls before relying on personal protective equipment.